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Segment and Related Information (Tables)
12 Months Ended
Dec. 31, 2021
Segment Reporting [Abstract]  
Schedule of Assets by Geographical Region
The following table reconciles assets by geographical region to total assets:
December 31,
(in millions)20212020
Net equipment, leasehold improvements and property:
United States$41.7 $38.4 
Rest of world1.9 2.3 
Total$43.6 $40.7 
Total assets:
United States$870.8 $1,190.3 
Rest of world51.1 56.8 
Total$921.9 $1,247.1 
Cash, cash equivalents, and marketable investment
     securities
398.8 171.7 
Total$1,320.7 $1,418.8